Mouse doesn't work

When I boot X-Windows my mouse doesn't work. I have a microsoft compatible 2-button mouse, on the 1st port which is as far as my setup tells me is /dev/ttys0 on linux.
In the X-Windows I've selected a microsoft compatible 2 button mouse at /dev/ttys0, I've setup my mouse in setup program on the same port, but everytime I boot x-windows I can't move it.

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